At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ISO 3506-3. ISO 3506-3 – Mechanical properties of corrosion-resistant stainless steel fasteners – Part 3: Set screws (and similar fasteners not under tensile stress). Covers stainless set screws, grub screws and similar parts loaded in compression/torsion (not axial tension), thread sizes ~M1.6-M24, specifying steel grades, hardness classes and minimum proof (breaking) torque.
ISO 3506-3 – Mechanical properties of corrosion-resistant stainless steel fasteners – Part 3: Set screws (and similar fasteners not under tensile stress). Covers stainless set screws, grub screws and similar parts loaded in compression/torsion (not axial tension), thread sizes ~M1.6-M24, specifying steel grades, hardness classes and minimum proof (breaking) torque.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| A1 / A2 / A3 / A4 / A5 | Austenitic stainless | Grades per ISO 3506-1 chemistry; A2/A4 most common |
| C1 / C3 / C4 | Martensitic stainless | Higher hardness set screws |
| F1 | Ferritic stainless | Lower-strength corrosion resistant |
Minimum mechanical requirements per ISO 3506-3.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Austenitic 12H | – | – | – | min ~130 HV (soft condition) |
| Austenitic 21H | – | – | – | min ~210 HV (cold-worked) |
| Martensitic C4-50H / C1-50H | – | – | – | approx 500 HV min (hardened) |
| Ferritic F1-45H | – | – | – | approx 450 HV min |
| Grade | Key Composition, % |
|---|---|
| A2 | Cr 15-20, Ni 8-19 (austenitic) |
| A4 | Cr 16-18.5, Ni 10-15, Mo 2-3 (austenitic, molybdenum-bearing) |
| C1 | Cr 11.5-14, martensitic |
Companion to ISO 3506-1 (bolts) and -2 (nuts). Performance is defined by minimum torque rather than tensile strength since these parts are not tension-loaded; grade chemistry aligns with ISO 3506-1.
For the official ISO standards catalogue, see the ISO standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We supply ISO 3506-3 fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
Ananka Fasteners supplies every lot with full material traceability and third-party testing on request.
ISO 3506-3 – Mechanical properties of corrosion-resistant stainless steel fasteners – Part 3: Set screws (and similar fasteners not under tensile stress). Covers stainless set screws, grub screws and similar parts loaded in compression/torsion (not axial tension), thread sizes ~M1.6-M24, specifying steel grades, hardness classes and minimum proof (breaking) torque.
Ananka Fasteners supplies A1 / A2 / A3 / A4 / A5, C1 / C3 / C4, F1 to ISO 3506-3. See the Grades / Classes Covered table above for full details of each grade.
Minimum tensile strength, yield strength, elongation and hardness requirements vary by grade — see the Mechanical Properties table above for the complete breakdown.
We supply ISO 3506-3 fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
Yes. For a quotation, provide the required fastener type, grade, nominal size, dimensional standard, quantity and any inspection or certificate requirements.
Need a fastener released to ISO 3506-3 for an industrial project? Send the required fastener type, grade, size, quantity and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: ISO 3506-3 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ISO 3506-3 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
